stu1=open('C:/Users/无？？/PycharmProjects/pythonProject13/DATA/$RHT6DZM.txt', mode='r', encoding='utf8')
print(stu1.read(100))    # 代表读100个字符
for i in stu1:
    print(stu1.readline())   # 一次只能读一行


print(stu1.readlines()) # 读完所有行
stu1.close()
